Head To Cover Gasket 8-94391379-0 8943913790 For ISUZU FVZ34 FVR34 FSR90 FTR FVR 6HK1 6HH1 — OEM Verified Rubber Seal, Direct Fit
| OEM Part Number: | 8-94391379-0 / 8943913790 | Part Name: | Head To Cover Gasket / Valve Cover Gasket (Upper) |
| Engine Compatibility: | ISUZU 6HK1 (7.8L), 6HH1 (8.2L) Diesel | Truck Models: | FVZ34, FVR34, FSR90, FTR, FVR; Also Referenced For FSR, FXR, FRR |
| Material: | Rubber / Elastomeric Sealing Compound | Net Weight (reference): | 0.05 Kg |
| Installation Position: | Cylinder Head To Valve Cover Interface | Condition: | Brand New — OEM / OEM-equivalent |
| Warranty: | Supplier-dependent — Confirm At Inquiry | ||
| High Light: | Head To Cover Gasket ISUZU,OEM Rubber Seal 8943913790,Direct Fit 6HK1 6HH1 Gasket |
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The Head to Cover Gasket with OEM numbers 8-94391379-0 / 8943913790 is a verified direct-fit replacement for ISUZU 6HK1 (7.8L) and 6HH1 (8.2L) diesel engines. This gasket is the upper valve cover seal that sits between the cylinder head and the valve cover (rocker cover), preventing engine oil from leaking out of the valve train area while keeping dust and contaminants out.
This gasket is specifically cataloged for ISUZU FVZ34, FVR34, FSR90, FTR, and FVR commercial trucks, as well as Hitachi ZX330-3, ZX350-3, and ZX400LCH-3 excavators powered by the 6HK1 engine. It is described as a rubber seal (ПРОКЛАДКА УПЛОТНИТЕЛЬ РЕЗИНОВЫЙ) in Russian ISUZU parts listings, indicating an elastomeric construction designed to maintain sealing force across the thermal cycling and vibration of a commercial diesel valve train.
The 8943913791 reference (with a different final digit) is also widely cataloged alongside this part. ProPartsDiesel lists 8943913790, 8943913791, 8-94391379-0, 8-94391379-1, 8-94391-379-0, and 8-94391-379-1 as cross numbers for the same 6HK1 valve cover gasket application. The 8943913800 / 8-94391380-0 reference is commonly paired with this gasket as the lower or companion seal in a valve cover gasket set.
- ✓OEM Cross-Reference Verified: Confirmed across 8-94391379-0, 8943913790, 8943913791, 8-94391379-1, 8-94391-379-0, and 8-94391-379-1.
- ✓Part Name / Function Verified: Cataloged as "GASKET; HD TO C" (Head to Cover) by PartSouq, and described as sealing the connection between the valve cover and cylinder head to prevent oil leakage in 6HK1 engines.
- ✓Material Verified: Listed as "ПРОКЛАДКА УПЛОТНИТЕЛЬ РЕЗИНОВЫЙ" (rubber sealing gasket) in ISUZU parts listings.
- ✓Weight Verified: 0.05 kg net weight — confirmed by German-market ISUZU truck parts listing.
- ✓Truck Coverage Verified: FVZ34, FVR34, FSR90, FTR, FVR with 6HK1/6HH1 engines.
- ✓Equipment Coverage Verified: Hitachi ZX330-3, ZX350-3, ZX400LCH-3, ZX400W-3; JCB JS series; Case CX300–CX370.
- ✓Paired / Companion Reference Verified: 8943913800 / 8-94391380-0 is listed alongside as the companion gasket in the same valve cover sealing set.
- Oil seepage at the valve cover perimeter: Visible wet oil film or drips running down the side of the cylinder head, often accumulating dirt over time — the most direct sign of gasket degradation.
- Burning oil smell from the engine bay: Oil leaking onto hot exhaust components produces a persistent burning odor, especially after the engine reaches operating temperature.
- Oil accumulation in spark plug wells / injector recesses: On engines where the valve cover seals individual injector or glow plug bores, a failed gasket allows oil to pool in these recesses.
- Low engine oil level without blue exhaust smoke: A valve cover leak reduces oil level without the telltale burning-oil smoke of piston ring or valve guide wear.
- Contamination ingress into the valve train: A compromised seal allows dust and moisture into the rocker arm area, accelerating wear on camshafts, rockers, and valve stems.
- Repeat leaks after a previous cover service: A common outcome of using an incorrect gasket profile, over-torqueing the cover bolts, or failing to clean the mating surfaces properly.
⚠️ Consequence of Ignoring Symptoms: A leaking valve cover gasket is rarely an immediate catastrophic failure, but it is a progressive oil loss path. On a commercial 6HK1/6HH1 engine, sustained oil seepage leads to low oil level, increased consumption, and oil contamination of the engine bay and belt drive system. Replacing a low-cost gasket at the first sign of seepage prevents more expensive cleanup and avoids the risk of oil starvation if the leak is left unchecked.
| Part Number | 8-94391379-0 / 8943913790 |
|---|---|
| Product Name | Head To Cover Gasket |
| Car Model | ISUZU FVZ34, FVR34, FSR90, FTR, FVR |
| Engine Model | ISUZU 6HK1 / 6HH1 |
| Condition | 100% Brand New |
| Size | Standard |
| Weight | Standard (0.05 kg net) |
| Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe |
| Package | Neutral Packing Or Made As Requested |
| Material | High-strength aluminum alloy & precision bearings |
| Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement |
| Quality Standard | OEM equivalent / ISO quality control |
| Brand | Model / Series | Engine | Notes |
|---|---|---|---|
| ISUZU | FVZ34 | 6HK1 | Core application, explicitly listed |
| ISUZU | FVR34 | 6HK1 | Confirmed |
| ISUZU | FSR90 | 6HK1 | Confirmed |
| ISUZU | FTR / FVR | 6HH1 / 6HK1 | Confirmed |
| ISUZU | FSR, FXR, FRR | 6HK1 | Broader platform coverage (1998–2011 reference) |
| Brand | Representative Models |
|---|---|
| Hitachi | ZX330-3, ZX350-3, ZX400LCH-3, ZX400W-3, ZX360, ZX370, ZX400, ZX500W, SCX150/700/800 |
| JCB | JS290, JS300, JS330, JS360, JS370, JZ330 |
| Case | CX300, CX330, CX350, CX370 |
| Others | Fiat Kobelco EX355; Hidromek HMK 300/370; IHI IC75/IC100; New Holland E385/EX355; Sany SY335/365; Sumitomo SH300–SH350, 470G; XCMG XE335/XE370; XGMA XG833/XG836 |
⚠️ Important Fitment Notes
- "Head to Cover" vs. other gaskets: This is the valve cover / rocker cover gasket, not the cylinder head gasket (head gasket) or the oil pan gasket. Confirm the required sealing location before ordering.
- 8943913790 vs. 8943913791: These two numbers are widely cross-listed as interchangeable for the same 6HK1 valve cover application. ProPartsDiesel treats them as the same functional part. However, confirm the physical marking on the original gasket if available.
- Companion gasket 8943913800: This reference is often listed alongside 8-94391379-0 as part of the same valve cover sealing set. If the cover uses two sealing surfaces (upper and lower, or cover-to-head and cover-to-injector bore), both gaskets may need replacement simultaneously. Confirm the vehicle's specific cover design at inquiry.
- JCB cross-reference 02/801177: This confirms the gasket's use in JCB equipment powered by the 6HK1 engine, expanding the application footprint beyond ISUZU trucks and Hitachi excavators.
| Feature | Benefit + Verification Signal |
|---|---|
| OEM-equivalent rubber construction | Maintains sealing force across the thermal cycling of the valve cover interface, resisting hardening and shrinkage that cause repeat leaks — confirmed by supplier material description (rubber sealing gasket). |
| Broad 6HK1 / 6HH1 truck coverage | One gasket serves FVZ34, FVR34, FSR90, FTR, and FVR commercial trucks — reducing inventory complexity for distributors serving mixed ISUZU heavy-duty fleets. |
| Extensive equipment compatibility | Confirmed for Hitachi ZX330-3/ZX350-3, JCB JS series, Case CX300–CX370, and additional excavator platforms powered by the 6HK1 — making it a high-turnover SKU for construction equipment parts distributors. |
| Dense cross-reference coverage | 8943913790, 8943913791, 8-94391379-0, 8-94391379-1, 8-94391-379-0, 8-94391-379-1, and JCB 02/801177 provide multiple verifiable sourcing paths when the primary number is constrained. |
| Low-cost, high-consequence part | A failed gasket is inexpensive to replace but prevents oil loss, engine bay contamination, and accelerated valve train wear — a classic preventive-maintenance item. |
| Documented net weight (0.05 kg) | Supports accurate freight calculation and cross-checking against supplier shipping data. |
| QC Item | Verification Method |
|---|---|
| Gasket profile / cutout geometry | Overlay or gauge verification against OEM valve cover pattern |
| Material integrity | Visual inspection for cracks, tears, or handling damage |
| Elastomeric compression set | Supplier material data / compression set resistance verification |
| Oil and heat resistance | Supplier specification for rubber compound compatibility with engine oil |
| Thickness uniformity | Micrometer or gauge verification across the sealing surface |
| Reference marking | Verify 8-94391379-0 / 8943913790 legibility where present |
| Companion gasket compatibility | Confirm whether 8943913800 is required for the specific valve cover design |
Because this gasket exists in multiple cross-referenced variants and is often paired with a companion gasket (8943913800), confirming the physical profile and the required sealing set on the first sample is recommended before bulk commitment.
⚠️ IMPORTANT: Valve cover gasket replacement requires clean mating surfaces and correct bolt torque sequence. Always refer to the ISUZU 6HK1/6HH1 workshop manual for the specific vehicle or equipment model. Residual old gasket material, oil contamination, or over-torqueing will cause repeat leakage regardless of gasket quality.
- Confirm the sealing set first: Determine whether the vehicle requires only 8-94391379-0 or the companion gasket 8943913800 as well. Some valve cover designs use a single perimeter seal; others use a set with additional injector bore seals.
- Clean the mating surfaces thoroughly: Remove all old gasket residue, oil film, and dirt from both the cylinder head face and the valve cover face. Do not gouge or scratch the machined surfaces — the elastomeric gasket seals only against a clean, flat surface.
- Inspect the valve cover for distortion: A warped or cracked plastic/composite valve cover will not seal properly even with a new gasket. Check the cover flange for flatness before installation.
- Position the new gasket: Seat the gasket on the cylinder head or valve cover (per the workshop manual instruction), ensuring all cutouts and bolt holes align. Do not stretch or distort the gasket during positioning.
- Install the valve cover and torque in sequence: Follow the workshop manual torque sequence and specification. Uneven or over-torqueing can crush the gasket unevenly, creating seepage paths. Valve cover bolts are often small-diameter shoulder bolts with a specified low torque — do not exceed the specification.
- Allow the engine to cool and re-check: After running the engine to operating temperature and cooling down, inspect the gasket joint for any sign of weeping. A small amount of oil seepage immediately after installation may be residual assembly oil, but persistent wetness indicates a sealing issue.
- Inspect the valve cover joint at every engine oil change — look for oil film, drips, or accumulated dirt adhering to oil seepage.
- Replace the gasket whenever the valve cover is removed for valve adjustment, injector service, or other top-end work — gaskets are single-use compression seals and should not be reused.
- Use the correct oil specification for the 6HK1/6HH1 and adhere to the recommended change interval; degraded oil accelerates gasket hardening and shrinkage.
- Address any seepage promptly — a slow valve cover leak can contaminate the belt drive system, alternator, and engine bay over time, leading to additional component failures.
- Standard packing: Neutral carton with protective flat packaging to prevent creasing; bulk export pallet available.
- Package contents: 1 × Head to Cover Gasket (valve cover gasket). Companion gasket 8943913800 is not included unless explicitly stated — specify at inquiry if the full sealing set is required.
- Set options: Single gasket / valve cover sealing set (8-94391379-0 + 8943913800) — specify at inquiry.
- Suitable for: ISUZU FVZ/FVR/FSR/FTR truck repair shops, Hitachi / JCB / Case equipment service providers, fleet maintenance departments, spare parts distributors, and export wholesalers serving Southeast Asia, the Middle East, Africa, and Latin America.
- Related parts available: Valve cover, companion gasket 8943913800, injector bore seals, oil pan gasket, and complete 6HK1 / 6HH1 upper-engine gasket kits.
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